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Leaving a party in the morning without bothering to say goodbye to any of your friends. Occasionally an entire party will do this to one person, leaving him/her with only the house owner. It is a depressing experience.
"Dude, everyone Sunshined me last night. I was the only person left in that weird guys house!"

"Where did she go? I think she totally Sunshined us!"
by SUNSHINED! March 19, 2010
To take advantage of a friends generosity.
She sunshined me when she let me buy all night then left with my brother and didn't even say goodnight
by ficklefingeroffate December 17, 2013
the art of a woman mooning with her virginal
My girlfriend sunshined me when i came home from work
by marvelous569 October 22, 2008